Site Description: The Island, which is owned by the Town of Greenwich, is 5000’ south of the mainland shore in Long Island Sound. The habitats are dominated by deciduous vegetation. Site contains woods, salt marsh, a lagoon, sandy beaches, and rocky shoreline. Several structures including a lighthouse are found on the site. The Town provides ferry access to the site to town residents.

Birds: Great Captain's Island is currently the site of the largest heron and egret rookery in Connecticut, with over 300 nesting pairs of nesting egrets and night-herons. There is also a large colony of Herring and Great Black-backed Gulls on the island. Species nesting on the island include: Great Egret, Snowy Egret, Little Blue Heron, Black-crowned Night-Heron, American Oystercatcher, and the two gull species. Islands have been shown to be important migratory stopover areas for Neotropical migrant landbirds. More studies are needed to document this aspect of Great Captain's Island.

Existing Conservation Measures: The island is used for public recreation in the nesting season. Audubon, with funds from the Geoffrey Hughes Foundation, The Quebec Labrador Foundation, and the Fairfield County Community Foundation and in cooperation with the Town of Greenwich, conducted a three-year study of the heron rookery to document the habitats of the island, the behavior of the nesting birds, predator threats to the colony, and human disturbance issues. Management recommendations were provided to the Town based on the results of the study.

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As the Connecticut state office of the National Audubon Society, our mission is to conserve and restore natural ecosystems, focusing on birds, other wildlife, and their habitats for the benefit of humanity and the earth’s biological diversity.